The GCF is 10.
Oh, dude, the greatest common factor of 50 and 80 is like the biggest number that can divide both of them evenly. So, you look at the factors of 50 (1, 2, 5, 10, 25, 50) and the factors of 80 (1, 2, 4, 8, 16, 40, 80) and the biggest number they have in common is 10. So, the greatest common factor of 50 and 80 is 10. Easy peasy, right?
"10 + 50 = 80" is an incorrect equation.
80 (50+10+10+10=80)
The GCF is 10.
80
Take your pick; 10 and 20, 10 and 30, 10 and 40, 10 and 50, 10 and 60, 10 and 70, 10 and 80, 10 and 90, 20 and 30, 20 and 50, 20 and 70, 20 and 90, 30 and 40, 30 and 50, 30 and 70, 30 and 80, 40 and 50, 40 and 70, 40 and 90, 50 and 60, 50 and 70, 50 and 80 50 and 90, 60 and 70, 70 and 80, 70 and 90, 80 and 90.
80% cause 8/10=80%
5/8 x 10/10 = 50/80 3/10 x 8/8 = 24/80 50/80 - 24/80 = 26/80 = 13/40
The factors of 50 are: 1, 2, 5, 10, 25, 50 The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
It is an 80% reduction ((50-10)/50)*100
50